Adding to the allowed tags in KSES

I would like to make a plugin which allows more than just img tags, I want to let people paste youtube embed code in etc.. but still block javascripts, form tags, iframes and meta’s for example, I looked about but theres no instruction, I looked at how allow images works but while it made sense that plugin doesnt work on bbpress 1.0 a6 so its pointless.

I know chrishajer but the bbvideo plugin is crap because people like and are used to putting in the embed code, my users are tech savie just not used to the restrictiveness, can I disable filtering for all attributes of the embed, object, img, and param tags?